liblzma: Change quoting style from `...' to '...'.

This was done for both internal and API headers.

src/liblzma/api/lzma/base.h

@@ -21,8 +21,8 @@
  *
  * This is here because C89 doesn't have stdbool.h. To set a value for
  * variables having type lzma_bool, you can use
- *   - C99's `true' and `false' from stdbool.h;
- *   - C++'s internal `true' and `false'; or
+ *   - C99's 'true' and 'false' from stdbool.h;
+ *   - C++'s internal 'true' and 'false'; or
  *   - integers one (true) and zero (false).
  */
 typedef unsigned char lzma_bool;
@@ -273,13 +273,13 @@ typedef enum {
 
 
 /**
- * \brief       The `action' argument for lzma_code()
+ * \brief       The 'action' argument for lzma_code()
  *
  * After the first use of LZMA_SYNC_FLUSH, LZMA_FULL_FLUSH, LZMA_FULL_BARRIER,
- * or LZMA_FINISH, the same `action' must be used until lzma_code() returns
+ * or LZMA_FINISH, the same 'action' must be used until lzma_code() returns
  * LZMA_STREAM_END. Also, the amount of input (that is, strm->avail_in) must
  * not be modified by the application until lzma_code() returns
- * LZMA_STREAM_END. Changing the `action' or modifying the amount of input
+ * LZMA_STREAM_END. Changing the 'action' or modifying the amount of input
  * will make lzma_code() return LZMA_PROG_ERROR.
  */
 typedef enum {
@@ -393,8 +393,8 @@ typedef enum {
  * Single-threaded mode only: liblzma doesn't make an internal copy of
  * lzma_allocator. Thus, it is OK to change these function pointers in
  * the middle of the coding process, but obviously it must be done
- * carefully to make sure that the replacement `free' can deallocate
- * memory allocated by the earlier `alloc' function(s).
+ * carefully to make sure that the replacement 'free' can deallocate
+ * memory allocated by the earlier 'alloc' function(s).
  *
  * Multithreaded mode: liblzma might internally store pointers to the
  * lzma_allocator given via the lzma_stream structure. The application
@@ -422,7 +422,7 @@ typedef struct {
 	 *                      liblzma never sets this to zero.
 	 *
 	 * \return      Pointer to the beginning of a memory block of
-	 *              `size' bytes, or NULL if allocation fails
+	 *              'size' bytes, or NULL if allocation fails
 	 *              for some reason. When allocation fails, functions
 	 *              of liblzma return LZMA_MEM_ERROR.
 	 *
@@ -622,7 +622,7 @@ typedef struct {
  * to and get output from liblzma.
  *
  * See the description of the coder-specific initialization function to find
- * out what `action' values are supported by the coder.
+ * out what 'action' values are supported by the coder.
  *
  * \param       strm    Pointer to lzma_stream that is at least initialized
  *                      with LZMA_STREAM_INIT.

src/liblzma/api/lzma/container.h

@@ -297,7 +297,7 @@ extern LZMA_API(uint64_t) lzma_easy_decoder_memusage(uint32_t preset)
  * to call lzma_end() after failed initialization.
  *
  * If initialization succeeds, use lzma_code() to do the actual encoding.
- * Valid values for `action' (the second argument of lzma_code()) are
+ * Valid values for 'action' (the second argument of lzma_code()) are
  * LZMA_RUN, LZMA_SYNC_FLUSH, LZMA_FULL_FLUSH, and LZMA_FINISH. In future,
  * there may be compression levels or flags that don't support LZMA_SYNC_FLUSH.
  *
@@ -679,13 +679,13 @@ extern LZMA_API(lzma_ret) lzma_microlzma_encoder(
  * supported by liblzma, only the .xz and .lz formats allow concatenated
  * files. Concatenated files are not allowed with the legacy .lzma format.
  *
- * This flag also affects the usage of the `action' argument for lzma_code().
+ * This flag also affects the usage of the 'action' argument for lzma_code().
  * When LZMA_CONCATENATED is used, lzma_code() won't return LZMA_STREAM_END
- * unless LZMA_FINISH is used as `action'. Thus, the application has to set
+ * unless LZMA_FINISH is used as 'action'. Thus, the application has to set
  * LZMA_FINISH in the same way as it does when encoding.
  *
  * If LZMA_CONCATENATED is not used, the decoders still accept LZMA_FINISH
- * as `action' for lzma_code(), but the usage of LZMA_FINISH isn't required.
+ * as 'action' for lzma_code(), but the usage of LZMA_FINISH isn't required.
  */
 #define LZMA_CONCATENATED               UINT32_C(0x08)
 
@@ -819,7 +819,7 @@ extern LZMA_API(lzma_ret) lzma_auto_decoder(
 /**
  * \brief       Initialize .lzma decoder (legacy file format)
  *
- * Valid `action' arguments to lzma_code() are LZMA_RUN and LZMA_FINISH.
+ * Valid 'action' arguments to lzma_code() are LZMA_RUN and LZMA_FINISH.
  * There is no need to use LZMA_FINISH, but it's allowed because it may
  * simplify certain types of applications.
  *

src/liblzma/api/lzma/filter.h

@@ -43,7 +43,7 @@ typedef struct {
 	/**
 	 * \brief       Filter ID
 	 *
-	 * Use constants whose name begin with `LZMA_FILTER_' to specify
+	 * Use constants whose name begin with 'LZMA_FILTER_' to specify
 	 * different filters. In an array of lzma_filter structures, use
 	 * LZMA_VLI_UNKNOWN to indicate end of filters.
 	 *
@@ -199,7 +199,7 @@ extern LZMA_API(uint64_t) lzma_raw_decoder_memusage(const lzma_filter *filters)
  *
  * This function may be useful when implementing custom file formats.
  *
- * The `action' with lzma_code() can be LZMA_RUN, LZMA_SYNC_FLUSH (if the
+ * The 'action' with lzma_code() can be LZMA_RUN, LZMA_SYNC_FLUSH (if the
  * filter chain supports it), or LZMA_FINISH.
  *
  * \param       strm      Pointer to lzma_stream that is at least
@@ -223,7 +223,7 @@ extern LZMA_API(lzma_ret) lzma_raw_encoder(
  *
  * The initialization of raw decoder goes similarly to raw encoder.
  *
- * The `action' with lzma_code() can be LZMA_RUN or LZMA_FINISH. Using
+ * The 'action' with lzma_code() can be LZMA_RUN or LZMA_FINISH. Using
  * LZMA_FINISH is not required, it is supported just for convenience.
  *
  * \param       strm      Pointer to lzma_stream that is at least

src/liblzma/api/lzma/index.h

@@ -709,7 +709,7 @@ extern LZMA_API(lzma_index *) lzma_index_dup(
  * \param       strm        Pointer to properly prepared lzma_stream
  * \param       i           Pointer to lzma_index which should be encoded.
  *
- * The valid `action' values for lzma_code() are LZMA_RUN and LZMA_FINISH.
+ * The valid 'action' values for lzma_code() are LZMA_RUN and LZMA_FINISH.
  * It is enough to use only one of them (you can choose freely).
  *
  * \return      Possible lzma_ret values:
@@ -738,7 +738,7 @@ extern LZMA_API(lzma_ret) lzma_index_encoder(
  *                          don't allow 0 here and return LZMA_PROG_ERROR;
  *                          later versions treat 0 as if 1 had been specified.
  *
- * Valid `action' arguments to lzma_code() are LZMA_RUN and LZMA_FINISH.
+ * Valid 'action' arguments to lzma_code() are LZMA_RUN and LZMA_FINISH.
  * There is no need to use LZMA_FINISH, but it's allowed because it may
  * simplify certain types of applications.
  *
@@ -842,10 +842,10 @@ extern LZMA_API(lzma_ret) lzma_index_buffer_decode(lzma_index **i,
  * expect to see the same exact value for the same file if you change the
  * input buffer size or switch to a different liblzma version.
  *
- * Valid `action' arguments to lzma_code() are LZMA_RUN and LZMA_FINISH.
+ * Valid 'action' arguments to lzma_code() are LZMA_RUN and LZMA_FINISH.
  * You only need to use LZMA_RUN; LZMA_FINISH is only supported because it
  * might be convenient for some applications. If you use LZMA_FINISH and if
- * lzma_code() asks the application to seek, remember to reset `action' back
+ * lzma_code() asks the application to seek, remember to reset 'action' back
  * to LZMA_RUN unless you hit the end of the file again.
  *
  * Possible return values from lzma_code():

src/liblzma/api/lzma/lzma12.h

@@ -289,7 +289,7 @@ typedef struct {
 	 * \brief       Number of literal context bits
 	 *
 	 * How many of the highest bits of the previous uncompressed
-	 * eight-bit byte (also known as `literal') are taken into
+	 * eight-bit byte (also known as 'literal') are taken into
 	 * account when predicting the bits of the next literal.
 	 *
 	 * E.g. in typical English text, an upper-case letter is

src/liblzma/lz/lz_encoder.h

@@ -225,7 +225,7 @@ typedef struct {
 //  3. The literals and matches are encoded using e.g. LZMA.
 //
 // The bytes that have been ran through the match finder, but not encoded yet,
-// are called `read ahead'.
+// are called 'read ahead'.
 
 
 /// Get how many bytes the match finder hashes in its initial step.

src/liblzma/rangecoder/range_decoder.h

@@ -50,7 +50,7 @@ rc_read_init(lzma_range_decoder *rc, const uint8_t *restrict in,
 
 /// Makes local copies of range decoder and *in_pos variables. Doing this
 /// improves speed significantly. The range decoder macros expect also
-/// variables `in' and `in_size' to be defined.
+/// variables 'in' and 'in_size' to be defined.
 #define rc_to_local(range_decoder, in_pos) \
 	lzma_range_decoder rc = range_decoder; \
 	size_t rc_in_pos = (in_pos); \